int run_with_raw_socket(options_t* opts, int raw_socket) { int ret; ret = set_reuse_socket(opts, raw_socket); if(ret) { perror("Unable to set reuse socket"); return 1; } ret = bind_to_interface(opts, raw_socket); if(ret) { perror("Unable to bind socket to interface"); return 1; } while(1) { read_packet_from_socket(opts, raw_socket); } return 0; }
void do_outgoing_connection(connection_t *c) { char *address, *port, *space; struct addrinfo *proxyai = NULL; int result; if(!c->outgoing) { logger(LOG_ERR, "do_outgoing_connection() for %s called without c->outgoing", c->name); abort(); } begin: if(!c->outgoing->ai) { if(!c->outgoing->cfg) { ifdebug(CONNECTIONS) logger(LOG_ERR, "Could not set up a meta connection to %s", c->name); c->status.remove = true; retry_outgoing(c->outgoing); c->outgoing = NULL; return; } get_config_string(c->outgoing->cfg, &address); space = strchr(address, ' '); if(space) { port = xstrdup(space + 1); *space = 0; } else { if(!get_config_string(lookup_config(c->config_tree, "Port"), &port)) port = xstrdup("655"); } c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM); free(address); free(port); c->outgoing->aip = c->outgoing->ai; c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg); } if(!c->outgoing->aip) { if(c->outgoing->ai) freeaddrinfo(c->outgoing->ai); c->outgoing->ai = NULL; goto begin; } memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen); c->outgoing->aip = c->outgoing->aip->ai_next; if(c->hostname) free(c->hostname); c->hostname = sockaddr2hostname(&c->address); ifdebug(CONNECTIONS) logger(LOG_INFO, "Trying to connect to %s (%s)", c->name, c->hostname); if(!proxytype) { c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); } else if(proxytype == PROXY_EXEC) { do_outgoing_pipe(c, proxyhost); } else { proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM); if(!proxyai) goto begin; ifdebug(CONNECTIONS) logger(LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport); c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP); } if(c->socket == -1) { ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno)); goto begin; } if(proxytype != PROXY_EXEC) configure_tcp(c); #ifdef FD_CLOEXEC fcntl(c->socket, F_SETFD, FD_CLOEXEC); #endif if(proxytype != PROXY_EXEC) { #if defined(SOL_IPV6) && defined(IPV6_V6ONLY) int option = 1; if(c->address.sa.sa_family == AF_INET6) setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option); #endif bind_to_interface(c->socket); } /* Connect */ if(!proxytype) { result = connect(c->socket, &c->address.sa, SALEN(c->address.sa)); } else if(proxytype == PROXY_EXEC) { result = 0; } else { result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen); freeaddrinfo(proxyai); } if(result == -1) { if(sockinprogress(sockerrno)) { c->status.connecting = true; return; } closesocket(c->socket); ifdebug(CONNECTIONS) logger(LOG_ERR, "%s: %s", c->hostname, sockstrerror(sockerrno)); goto begin; } finish_connecting(c); return; }
int setup_vpn_in_socket(const sockaddr_t *sa) { int nfd; char *addrstr; int option; nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP); if(nfd < 0) { logger(LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno)); return -1; } #ifdef FD_CLOEXEC fcntl(nfd, F_SETFD, FD_CLOEXEC); #endif #ifdef O_NONBLOCK { int flags = fcntl(nfd, F_GETFL); if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) { closesocket(nfd); logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno)); return -1; } } #elif defined(WIN32) { unsigned long arg = 1; if(ioctlsocket(nfd, FIONBIO, &arg) != 0) { closesocket(nfd); logger(LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno)); return -1; } } #endif option = 1; setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof(option)); setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof(option)); if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf))) logger(LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno)); if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf))) logger(LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno)); #if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY) if(sa->sa.sa_family == AF_INET6) setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option); #endif #if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT) #define IP_DONTFRAGMENT IP_DONTFRAG #endif #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO) if(myself->options & OPTION_PMTU_DISCOVERY) { option = IP_PMTUDISC_DO; setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option)); } #elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT) if(myself->options & OPTION_PMTU_DISCOVERY) { option = 1; setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option)); } #endif #if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO) if(myself->options & OPTION_PMTU_DISCOVERY) { option = IPV6_PMTUDISC_DO; setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option)); } #elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG) if(myself->options & OPTION_PMTU_DISCOVERY) { option = 1; setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option)); } #endif if (!bind_to_interface(nfd)) { closesocket(nfd); return -1; } if(bind(nfd, &sa->sa, SALEN(sa->sa))) { closesocket(nfd); addrstr = sockaddr2hostname(sa); logger(LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno)); free(addrstr); return -1; } return nfd; } /* int setup_vpn_in_socket */